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Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters

Reference Guide

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Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters

Table of Contents

Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Chapter 2 Meter Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Display Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Keypad Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Meter Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Chapter 3 Meter Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Navigating the Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Setup Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Read Type Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9Entering the Nominal Cell Constant for Conductivity . . . . . . .9Adjusting the TDS Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Chapter 4 Calibration and Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Conductivity Calibration and Conductivity/TDS Measurement . . . . . . . . . . . . 11Conductivity Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . .11Conductivity /TDS Measurement . . . . . . . . . . . . . . . . . . . .11

Temperature Measurement and Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Temperature Measurement. . . . . . . . . . . . . . . . . . . . . . . . .12Temperature Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Chapter 5 Data Storage and Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Automatic Datalog with AUTO-READ™ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Manual Datalog with Continuous Read Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Viewing Stored Readings (the Data Log) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Chapter 6 Customer Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Meter Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Troubleshooting Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Warranty and Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16WEEE Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Meter Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Chapter 7 Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Temperature Compensation and Reference Temperature . .21Total Dissolved Solids (TDS) . . . . . . . . . . . . . . . . . . . . . . . .21Automatic Conductivity Calibration . . . . . . . . . . . . . . . . . . .22Table of Conductivity Standard Values vs. Temperature . . .22

Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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1Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters

Chapter 1 Introduction

Thank you for your purchase of the Orion Star A112 benchtop conductivity or Star A122 portable conductivity meter.

These meters are capable of measuring conductivity in μS/cm or mS/cm; TDS in mg/L; and temperature in °C or °F.

The Orion Star A112 benchtop conductivity meters are IP54-rated. The Orion Star A122 portable conductivity meters

feature a waterproof, IP67-rating.

Please read this reference guide thoroughly. Any use outside of these instructions may invalidate your warranty and

cause permanent damage to the meter.


Chapter 2 Meter Overview

Connections

1. Power source:

a. Power adapter (included with Orion Star A112 benchtop conductivity meters, sold separately for Star

A122 portable conductivity meters) – Select the appropriate wall socket plug. Slide off the clear plastic

cover, and slide on the plug plate into the groove on the back of the adapter.

b. Batteries (included with and factory installed on Star A122 portable conductivity meters, sold separately

for Star A112 benchtop conductivity meters) – Select four AA batteries. Confirm that the meter is off

and remove the battery compartment cover. On the Star A122 portable meter, to remove the battery

compartment cover:

i. Loosen the screws.

ii. Release the top portion of the battery compartment from the meter (using a coin or your finger.)

iii. Release the bottom portion of the battery compartment (using a coin or your finger). Insert

batteries as shown in the battery compartment housing.

Push down on tab and lift the battery cover

Orion Star A112 Benchtop

Remove screws

Orion Star A122 Portable

Figure 1

2. Prepare the conductivity probe according to the directions in the conductivity probe user guide. In general, this includes

rinsing the cell with distilled water.

3. Connect the appropriate item as labeled on the meter and as shown in figure 1:

4 Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters

Display Information

Display Icon Description

MEAS Indicates that the meter is in the measurement mode.

SETUP Indicates that the meter is in setup mode.

CAL Indicates that the meter is the calibration mode.

MAN Shown when a manual calibration is being done.

AUTO Shown when automatic calibration buffers are used (100 μS/cm, 1413 μS/cm or 12.9 mS/cm).

Shows the battery status (more bars = more power remaining).

Blinks when power is low and the battery needs to be changed.

(Orion Star A122 Conductivity portable meter includes factory-installed batteries.)

Shown when the meter is running on AC power.

(Orion Star A112 Conductivity benchtop meter includes adapter.)

Shown when the meter is on AUTO-READ mode. Default setting. AR and unit of measure will blink until the reading

is stable. When the reading is stable it is held on the screen and AR is lit.

Press to take a new reading.

READY Unit of measurement will blink until the reading is stable. When the reading is stable, READY is lit.

Appears during calibration and after a calibration is done.

Displayed when a reading is stored into the memory.

Displayed when viewing stored readings.

Secondary display Upper display which shows temperature reading in measurement mode and setup menu in setup mode.

Primary display Larger, lower display showing measured value in selected mode.

Instructions Located below the primary display. These phrases aid in the setup menu and calibration modes.


Keypad Information

Meter Maintenance

For routine meter maintenance, dust and wipe the meter with a damp cloth. If necessary, warm water or a mild water-

based detergent can be used. Meter maintenance can be performed on a daily, weekly or monthly basis, as required by

the environment in which the meter is operated. Immediately remove any spilled substance from the meter using the

proper cleaning procedure for the type of spill.

In the measurement screen: Press to take a measurement.

In the setup screen: Press to escape the setup menu.

In the calibration screen: Press to abort calibration.

Press to turn the meter on or off.

In the measurement screen: Press to switch between modes.

In the setup screen: Press to confirm the selection.

Press to enter the calibration mode. Press to enter the setup mode.

In the measurement screen:Press to store the data on the screen in continuous

read mode and with data logging on.

In the setup screen:Press to scroll up in the list of options.

In the measurement screen: Press to see the stored data.

In the setup screen: Press to scroll down in the list of options.


Chapter 3 Meter Setup

Pressing will take you to the setup menu.

Navigating the Setup Menu

A complete chart showing the main setup levels and submenus is shown after these steps.

1. In the setup menu, press or until the desired main setup level is shown on the top (secondary display) line.

2. Press to enter into the submenu options.

3. For main setup options with more than one submenu:

1.0 Configuration

5.0 Datalog Clear

a. Press or until the desired submenu is shown.

b. Press to enter into the submenu.

c. Press or until the desired option is shown.

d. Press to save your selection.

For main setup options with one submenu:

2.0 General Meter Setup

3.0 Temperature Settings

4.0 Read Type

6.0 Calibration Data

7.0 Factory Reset

a. Press or until the desired option is shown.

b. Press to save your selection.

4. Press to exit the setup menu and return to measurement mode.


Meter Setup

Setup Menu Level

Secondary Display

Primary Display

Description Information

Main 1.0 CONF Configuration Select temperature coefficient, TDS factor, cell

constant and reference temperature information.

Submenu COEF 0.0 to 10.0 Linear Temperature

Compensation Coefficient

2.1 is the default.

Submenu TDSF 0.00 to 10.00 TDS Factor 0.49 is the default.

Submenu CELL 0.001 to 10.00 Conductivity Cell

Constant

Used for conductivity automatic calibration with

a Thermo Scientific Orion conductivity standard.

Default is 0.475.

Submenu TREF 20.0, 25.0 Conductivity Reference

Temperature

25.0 is the default.

Main 2.0 GEN General Meter Setup Automatic meter shut-off

Submenu AUTO ON, OFF Automatic Meter Shut-

Off

To save battery life, the meter will turn off after

15 minutes without button presses. On is the

default setting.

Main 3.0 TEMP Temperature Settings Select temperature units and the temperature

used for manual temperature compensation

Submenu UNIT DEGC, DEGF Temperature Unit The default setting is for temperature readout to

be displayed in °C.

Submenu DEGC or

DEGF

-5.0 to 105.0 Manual Temperature

Compensation Value

This value is used when there is no ATC probe

connected, and can be set with the meter’s

temperature ranges. The temperature unit for

this value will match the temperature unit already

selected. The default setting is 25.0°C.

Main 4.0 READ Read Type

Submenu READ AUTO, CONT AUTO is for AUTO-READ.

CONT is for continuous

read.

In AUTO-READ mode, the meter will display the

measurement as it stabilizes and lock and hold the

measurement when it is stable. Press to

take a new measurement.

In Continuous read mode, the meter will

continuously measure and update the display. The

unit of measure will flash. When the reading has

been stable, “READY” will stop flashing.

The default setting is AUTO-READ.

Main 5.0 LOG Datalog Clear

Submenu DATA ON, OFF To enable data storage The default is off.

Submenu DEL LAST, ALL, NO Clears stored readings in

the datalog.

The default is no.

"NO" does not delete any readings.

"LAST" deletes only the last reading.

"ALL" deletes all of the logged data.

Main 6.0 CAL Calibration Data

Submenu CLR NO, YES Clears the calibration data. The default is no.

Main 7.0 RST Factory Reset

Submenu RST NO, YES Returns all meter settings

to the factory defaults and

deletes all stored data

(calibration and datalog).

The default is no. Before selecting yes, please

make sure any data that you would like to keep

has been recorded.


Setup Examples

Read Type Selection

1. In measurement mode, press .

2. Press three times in setup until “4.0” is shown on the top line and “READ” is shown on the

lower line. Press .

3. Press or to select the measurement mode:

CONT = Continuous

AUTO = AUTO-READ™

Note: In AUTO-READ mode, the meter will display the measurement as it stabilizes and lock and hold the

measurement when it is stable. AR and unit of measure will blink until the reading is stable. When the

reading is stable it is held on the screen and AR is lit.

Press to take a new measurement.

In Continuous read mode, the meter will continuously measure and update the display. The unit of

measure will flash. When the reading has been stable, “READY” will appear. This read type is useful

when performing an experiment that requires continuous measurements to be taken, regardless of the

measurement stability.

4. Press to save configuration and to return measurement mode.

Entering the Nominal Cell Constant for Conductivity

1. Press to enter the setup mode.

2. Press three times to enter the 1.0 configuration menu and the submenu for cell constant.

3. Press or to enter the cell constant value to use for automatic calibration.

Note: Holding the button down will make the value change faster.


Adjusting the TDS Factor

The default value is 0.49.


2. Press two times (“TDSF” is displayed on the top line).

3. Press or to enter the TDS factor.

Note: Holding the button down will make the value change faster.



Chapter 4 Calibration and Measurement

Conductivity Calibration and Conductivity/TDS Measurement

Conductivity Calibration

The single-point calibration can be done automatically or manually with your standard. Automatic calibration can be done

using Thermo Scientific Orion conductivity standards at 100 μS/cm, 1413 μS/cm or 12.9 mS/cm.

1. Make sure the conductivity probe is connected to the meter, and the cell constant has been confirmed (or adjusted if

needed) in the setup menu.

2. Select the conductivity standard closest to the expected sample conductivity. The meter will use the cell constant

value entered in the setup menu for automatic calibration.

3. Rinse the conductivity probe with distilled water, and insert into the standard and stir gently. Press .

4. “CAL” will appear in the upper right of the display. Wait for “READY” to appear.

5. If “AUTO” appears at the top middle of the display. This indicates the automatic calibration mode and the standard

was recognized. Press to view the calculated cell constant and after 2 seconds the meter will proceed to

measurement mode.

6. If “MAN” appears at the top next to “CAL”, this indicates a manual calibration mode.

a. Press or to adjust the value to match your standard.

b. Press to view the calculated cell constant and after 2 seconds the meter will proceed

to measurement mode.

Conductivity /TDS Measurement

To measure TDS, confirm the TDS factor is correct and adjust if necessary in the setup menu. The same steps below can

be followed with the units being mg/L.

1. Press to display readings in conductivity.

Note: The units will be μS/cm or mS/cm. The meter will auto-range to select the appropriate unit).

2. Rinse the conductivity probe with distilled water and blot dry. Insert the probe into the sample and stir gently.

3. If the meter is in AUTO-READ mode (meter default), press . If the meter is in continuous read mode, the meter

will immediately start taking readings. Record the result and temperature of the sample when “READY” is displayed

and the unit of measurement stops blinking.

Note: If in AUTO-READ mode and memory storage is enabled, the reading will automatically be stored when the

“AR” appears. If in continuous read mode and memory storage is enabled, press to store into the meter’s memory.

4. Remove the conductivity probe from the sample, rinse with distilled water and blot dry. To continue taking

measurements, place the probe into the next sample, stir gently and repeat step 3.

5. When finished measuring all samples, store probe according to the probe instructions.


Temperature Measurement and Calibration

The Orion Star A112 benchtop conductivity and Star A122 portable conductivity meter show temperature on the

top, secondary display. To read only temperature and see the temperature on the primary, lower display, follow the

instructions below.

Temperature Measurement

1. In the measurement mode, press to display the temperature value on the primary display. (The temperature

value at the top, secondary display will match that of the lower, primary display field.)

2. Rinse with probe with distilled water, blot dry and place into the sample. If the meter is in AUTO-READ mode (meter

default), press . If the meter is in continuous read mode, the meter will immediately start taking readings.

Note: If in AUTO-READ mode and memory storage is enabled, the reading will automatically be stored when

the “AR” appears. If in continuous read mode and memory storage is enabled, press to store into

the meter’s memory.

3. Remove the probe from the sample, rinse with distilled water and blot dry. To continue taking measurements, place

the probe into the next sample and repeat steps 2 and 3.

4. When finished measuring all samples, store probe according to probe instructions.

Temperature Calibration

The meter temperature display has a relative accuracy of ± 0.1 °C. Temperature probes may have varying temperature

accuracies, usually ± 0.5 °C to ± 2 °C. Use this function only if it is necessary to calibrate the temperature readings. Since

the temperature offset calculated during the calibration is applied to all future temperature measurements, recalibrate if

a different probe is used.

1. In the measurement mode, press to display the temperature reading.

2. Rinse the probe and NIST-traceable thermometers with distilled water, blot dry and place into a solution with a

known, stable temperature.

Note: It is recommended that two NIST-traceable thermometers be used to measure and verify the temperature of the

solution.

Press .

3. Wait for the readings to stabilize (about 5 to 10 minutes) and “READY” to stop flashing. The meter will display

the original temperature read by the probe. Press or keys to enter the temperature value read by the

thermometer.

Note: The calculated offset will be applied to all future temperature readings. To abort, press to end without

saving and return to the measurement mode.

4. When finished, press to save and end calibration.


Chapter 5 Data Storage and Review

Orion Star A112 benchtop conductivity and Star A122 portable conductivity meters have a 50-point datalog memory.

Automatic Datalog with AUTO-READ™ Mode


2. Press three times until “4.0” is shown on the top line and “READ” is shown on the lower line. Press .

3. Press or to show “AUTO” on the second line. Press to save selection.

4. Press to show “5.0” on the top line and “LOG” on the lower line. Press .

5. Press to show “ON” on the second line. Press to save selection.

6. Press to return to measurement mode. Each time the reading is locked onto the screen with the “AR” icon.

The reading will automatically be stored in the datalog.

Manual Datalog with Continuous Read Mode


2. Press three times until “4.0” is shown on the top line and “READ” is shown on the lower line. Press .

3. Press or to show “CONT” on the second line. Press the “Mode/enter” key to save selection.

4. Press to show “5.0” on the top line and “LOG” on the lower line. Press .

5. Press to show “ON” on the second line. Press to save selection.

6. Press to return to measurement mode.

7. In the measurement mode, press to store the reading into the meter’s memory.

Viewing Stored Readings (the Data Log)


2. Press or to scroll through the memory points.

3. Press to review the reading stored at that point.


Chapter 6 Customer Services

Meter Error Codes

Display Reason Solution

Calibrated cell

constant is out

of range.

The cell constant is not in the range of 0.001 to 199.0 cm-1. Clean the conductivity probe according to

the probe user guide. Re-calibrate the probe with new standards.

Memory is full The meter will automatically change to the submenu to clear the datalog (“CLR” on the top line,

“NO” on the second).

If the existing memory’s data is still needed:

1. Press to return to the measurement mode and . Record the memory’s data.

2. In measurement mode, press and then 4 times. (“5.0” appears on the top line.)

3. Press . Press to delete the last reading or press to delete all readings.

4. Press to save the change and delete the data accordingly.

If the existing memory’s data can be deleted:

1. Press change to “YES”.

2. Press to clear the datalog.


Troubleshooting Guide

Problem: The display freezes and the measurement values will not change.

Solution: The meter is in the AUTO-READ measurement mode (the AR icon appears solid on the left of the display).

Press to start a new reading or select continuous read mode to have readings update constantly.

Problem: How do I abort a calibration?

Solution: Press abort any meter operation and return to the measurement mode.

Problem: The meter does not recognize the conductivity standard during calibration.

Solution: Verify that the default cell constant was entered in the setup menu. The cell constant is usually printed on

the conductivity probe cable. Verify that the conductivity standard is one that is programmed into the meter.

Re-calibrate with a fresh standard.

Problem: The measurement is out of range when it should be in range.

Solution: Check that the conductivity probe is fully immersed in the solution. Verify that the cell constant is correct for

the conductivity probe that is connected to the meter.

Assistance

After troubleshooting all components of your measurement system, contact Technical Support. Within the United States

call 1.800.225.1480 and outside the United States call 978.232.6000 or fax 978.232.6031. In Europe, the Middle East

and Africa, contact your local authorized dealer. For the most current contact information, or the latest application and

technical resources for Thermo Scientific Orion products, visit www.thermoscientific.com/water.

Warranty and Registration

To register your new meter and for the most current warranty information,

visit www.thermoscientific.com/water.

WEEE Compliance

This product is required to comply with the European Union’s Waste Electrical & Electronic Equipment (WEEE) Directive

2002/96/EC. It is marked with the symbol above.

Thermo Fisher Scientific has contracted with one or more recycling/disposal companies in each EU Member State and

this product should be disposed of or recycled through them. Further information on compliance with these directives,

the recyclers in your country, and information on Thermo Scientific Orion products that may assist the detection of

substances subject to the RoHS Directive are available at www.thermoscientific.com.


Declaration of Conformity

Manufacturer: Thermo Fisher Scientific Inc.

Address: Ayer Rajah Crescent Blk 55 #04-16/24 Singapore 139949 Singapore

Hereby declares that the following products:

Benchtop meters are rated 100 to 240 VAC, 50/60 Hz, 0.5A.

Handheld meters use four non-rechargeable AA batteries.

Benchtop Meters Portable MetersOrion Star A111 pH Orion Star A121 pH

Orion Star A112 Conductivity Orion Star A122 Conductivity

Orion Star A113 DO Orion Star A123 DO

Equipment Class:

Measurement, control and laboratory

Orion Star A-series meters are EMC Class A

Conforms with the following directives and standards:

EN61326-1:2006 Electromagnetic Compatibility (EMC Directive) Electrical equipment for measurement, control and laboratory use - EMC requirements

EN61010-1:2001 Safety StandardsUL61010-1:2004 Safety requirements for electrical equipment for measurement, CAN/CSA C22.2 No. 61010-1-04 control and laboratory use - general requirements

Cheow Kwang Chan QA/Regulatory Manager

Place and Date of Issue: June 15, 2011 Singapore


Meter Specifications

Meter Operating ConditionsOperating Ambient Temperature 5 to 45 °C

Operating Relative Humidity 5 to 85 %, non-condensing

Storage Temperature -20 to +60 °C

Storage Relative Humidity 5 to 85 %, non-condensing

Pollution Degree 2

Overvoltage Category II

Weight Portable: 450g

Benchtop: 850g

Size Portable: 5.9 cm (H) x 10.5 cm (W) x 23.1 cm (D)

Benchtop: 9.3 cm (H) x 18.0 cm (W) x 23.6 cm (D)

Regulatory and Safety CE, TUV 3-1, FCC Class A

Power Rating DC Input: 9 VDC 1A

Battery: 4 x AA

Shock and Vibration Vibration, shipping/handling per ISTA #1A Shock, drop test in packaging per ISTA #1A

Warranty 3 years meter replacement

Universal Power Adapter Operating ConditionsOperating Ambient Temperature 0 to 50 °C

Operating Relative Humidity 0 to 90 %, non-condensing

Storage Temperature -20 to +75 °C

Storage Relative Humidity 0 to 90 %, non-condensing

Pollution Degree 2

Overvoltage Category II

Meter Parameter SpecificationsConductivity

Range 0.1 uS/cm to 200 mS/cm

Resolution 0.01uS Minimum;

3 significant figures minimum

Relative Accuracy 0.5% reading ±1 digit

Reference Temperature 20 °C or 25 °C (default)

Compatible Cell Constants 0.001 to 10.00

Number of Calibration Points 1

TDS

Range 1 to 19,999 ppm

Resolution 4 significant digits

Relative Accuracy 0.5% reading ±1 digit

TDS Factor Range Linear 0.01 to 10.00

Temperature

Range -5 to 105°C

Resolution 0.1

Relative Accuracy ±0.1

Offset Calibration 1 point

Memory 50 points

Note: Specifications subject to change without notice.


Ordering Information

Benchtop meters include electrode arm. Kits contain meter, probe and appropriate calibration and fill solutions. Portable meter kits include a carrying case.

CML # Description

STARA1110 Orion STAR A111 Benchtop pH Meter

STARA1115 Orion STAR A111 Benchtop pH Meter Kit

STARA1120 Orion STAR A112 Benchtop Conductivity Meter

STARA1125 Orion STAR A112 Benchtop Conductivity Meter Kit

STARA1130 Orion STAR A113 Benchtop Dissolved Oxygen Meter

STARA1135 Orion STAR A113 Benchtop Dissolved Oxygen Meter Kit

STARA1210 Orion STAR A121 Portable pH Meter

STARA1215 Orion STAR A121 Portable pH Meter Kit

STARA1220 Orion STAR A122 Portable Conductivity Meter

STARA1225 Orion STAR A122 Portable Conductivity Meter Kit

STARA1230 Orion STAR A123 Portable Dissolved Oxygen Meter

STARA1235 Orion STAR A123 Portable Dissolved Oxygen Meter Kit

STARA-BEA Benchtop electrode arm for Orion Star A-series meters

STARA-HB Freestanding Base for use with Orion Star A-series benchtop electrode arm

STARA-CS Hard Carrying Case for Orion Star A-series Portable Meters

STARA-AR Armor for Orion Star A-series Portable Meters, includes electrode holders for

pH, conductivity and DO probes

STARA-ESPH pH Electrode Holder for Orion Star A-series Armor

STARA-ESCD Conductivity and DO Probe Holder for Orion Star A-series Armor

9157BNMD Orion Triode 3-in-1 pH/ATC Probe, Refillable, epoxy body

9107BNMD Orion Triode 3-in-1 pH/ATC Probe, Gel-filled, epoxy body

011050MD Orion 2-Electrode Conductivity Cell, K=1.0

083005MD Orion Polarographic DO probe , 1.5m cable


Chapter 7 Appendix

Temperature Compensation and Reference Temperature

The Orion Star A112 benchtop conductivity and Star A122 portable conductivity meters have the ability to use a

temperature compensation feature that calculates and displays the conductivity measurements at a reference

temperature of 20 °C or 25 °C. The closer the sample temperature is to the selected reference temperature, the more

accurate the conductivity measurement will be.

The conductivity of a solution with a specific electrolyte concentration changes with temperature and this relationship is

described by the temperature coefficient of the solution. The meter has a default temperature coefficient of 2.1 percent

change in conductivity per ˚C, which is representative of many aqueous samples.

Ultra Pure Water 4.55

Salt (NaCl) 2.12

5% NaOH 1.72

Dilute Ammonia 1.88

10% HCl 1.32

5% Sulfuric Acid 0.96

98% Sulfuric Acid 2.84

Sugar Syrup 5.64

Total Dissolved Solids (TDS)

The Orion Star A112 benchtop conductivity and Star A122 portable conductivity meters measure TDS as the total amount

of dissolved inorganics in a solution. The dissolved inorganics carry a current that is measured by the conductivity

probe. Since there is a direct relationship between conductivity and TDS, conductivity readings are used to estimate the

presence of inorganics. The user must enter a TDS factor between 0.01 and 10 mg/L in the setup menu.

The standard method of determining TDS involves evaporating a sample to dryness at 180 ˚C and weighing the residue.

The TDS factor is calculated by taking the residue weight and dividing it by the sample conductivity. Subsequent

conductivity readings are multiplied by the TDS factor to determine the TDS value of the sample.

Automatic Conductivity Calibration

The Orion Star A112 benchtop conductivity and Star A122 portable conductivity meters are capable of automatically

recognizing 100 μS/cm, 1413 μS/cm and 12.9 mS/cm conductivity standards when the nominal cell constant of the

conductivity probe is entered in the setup menu.


Table of Conductivity Standard Values vs. Temperature

Cat. No. 011005 011006 011007 01100910 011008

Temperature (°C)

111.9 mS/cm Conductivity

Standard (mS/cm)


Standard (mS/cm)

1413 μS/cm Conductivity

Standard (μS/cm)


Standard (μS/cm)


Standard (μS/cm)

0 65.10 7.135 776 81 54

1 66.84 7.344 799 83 56

2 68.59 7.555 822 86 58

3 70.35 7.768 846 88 59

4 72.12 7.983 870 91 61

5 73.91 8.200 894 93 63

6 75.70 8.418 918 96 64

7 77.50 8.638 943 98 66

8 79.32 8.860 968 101 68

9 81.15 9.084 992 103 70

10 82.98 9.309 1017 106 72

11 84.83 9.535 1043 108 73

12 86.69 9.763 1068 111 75

13 88.56 9.993 1094 114 77

14 90.45 10.22 1119 116 79

15 92.34 10.46 1145 119 81

16 94.24 10.69 1171 122 83

17 96.15 10.93 1198 125 85

18 98.08 11.16 1224 127 87

19 100.0 11.40 1251 130 88

20 102.0 11.64 1277 133 90

21 103.9 11.88 1304 136 92

22 105.9 12.12 1331 138 94

23 107.9 12.36 1358 141 96

24 109.9 12.61 1386 144 98

25 111.9 12.85 1413 147 100

26 113.9 13.10 1441 150 102

27 115.9 13.35 1468 153 104

28 117.9 13.59 1496 156 106

29 120.0 13.84 1524 159 108

30 122.0 14.09 1552 161 110

31 124.1 14.34 1580 164 112

32 126.2 14.59 1608 167 114

33 128.3 14.85 1636 170 117

34 130.4 15.10 1665 173 119


Cat. No. 011005 011006 011007 01100910 011008

Temperature (°C)


Standard (mS/cm)


Standard (mS/cm)


Standard (μS/cm)


Standard (μS/cm)


Standard (μS/cm)

35 132.5 15.35 1693 176 121

36 134.6 15.61 1722 179 123

37 136.7 15.86 1751 182 125

38 138.9 16.12 1780 185 127

39 141.0 16.37 1808 188 129

40 143.2 16.63 1837 191 131

41 145.4 16.89 1866 194 134

42 147.6 17.15 1896 197 136

43 149.8 17.40 1925 200 138

44 152.0 17.66 1954 203 140

45 154.2 17.92 1983 206 142

46 156.4 18.18 2013 209 145

47 158.7 18.44 2042 212 147

48 160.9 18.70 2071 215 149

49 163.2 18.96 2101 219 151

50 165.4 19.22 2130 222 154


Notes

9 0 0 1 : 2 0 0 8

267276-001 Rev. B 07-11

Water Analysis Instruments

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Beverly, MA 01915 USA

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